Which of the following equations is Rittinger's crushing law ?(where P = power r

Question

Which of the following equations is Rittinger's crushing law ?
(where P = power required by the machine, m = feed rate, k = a constant, D̅sa & D̅sb = volume surface mean diameter of feed & product respectively.)

Options:

A . A

B . B

C . C

D . D

Answer: Option C
Answer: (c).C

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